Title :
Dynamic field quality of LHC/Saclay arc quadrupole magnet prototype
Author :
Devred, A. ; Belorgey, J. ; Deregel, J. ; Gallet, B. ; Genevey, P. ; Kircher, F. ; Rifflet, J.M. ; Sellier, J.C. ; Védrine, P. ; Billan, J. ; Ogitsu, T.
Author_Institution :
DSM/DAPNIA/STCM, CEA, Centre d´´Etudes Nucleaires de Saclay, Gif-sur-Yvette, France
Abstract :
As part of the magnet R&D program for the Large Hadron Collider (LHC), CEA Saclay has designed and built two 3-m-long, 56-mm-twin-aperture are quadrupole magnet prototypes. Extensive field quality measurements were performed during the cold-test of the second prototype. A review of the field quality data as a function of ramp rate is presented. The observed field distortions are explained in terms of inter-strand coupling currents arising from low and non-uniform resistances at the crossovers between the strands of the two-layer Rutherford-type cable. Last, the distribution of crossover resistances within the quadrupole magnet coil is determined
Keywords :
accelerator magnets; magnetic field measurement; proton accelerators; storage rings; superconducting magnets; synchrotrons; LHC; Large Hadron Collider; crossover resistances; field distortions; field quality measurements; inter-strand coupling currents; quadrupole magnet prototype; two-layer Rutherford-type cable; Iron; Large Hadron Collider; Magnetic field measurement; Power cables; Prototypes; Saturation magnetization; Superconducting cables; Superconducting coils; Superconducting filaments and wires; Superconducting magnets;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.753210
